Joan Rivers -- Gives Justin Bieber a Pass for Anne Frank Comment

Joan Rivers -- who tears people apart with nearly every breath she takes -- is shockingly giving Justin Bieber the benefit of the doubt for his recent crack about Anne Frank ... and even thinks he might have done some good.

You'll recall ... Bieber visited the Anne Frank House in Amsterdam and signed the guest book by writing, "Anne was a great girl. Hopefully she would have been a belieber."

While virtually everyone SLAMMED Biebs for the insensitive remark, Joan told us she thinks his words just "came out wrong" -- and then she said something positive about JB and Selena Gomez!